2 
bear_moved = False 

while True: 
    next = raw_input("> ") 

    if next == "take honey": 
        dead("The bear looks at you then slaps your face off.") 
    elif next == "taunt bear" and not bear_moved: 
        print "The bear has moved from the door. You can go through." 
        bear_moved = True 
    elif next == "taunt bear" and bear_moved: 
        dead("The bear gets pissed off and chews your leg off.") 
    elif next == "open door" and bear_moved: 
        gold_room() 
    else: 
        print "I got no idea what that means.

这是为了表明我对布尔值的理解。在测试行next == "taunt bear" and not bear_moved中，如果我的输入是taunt bear，结果是True and True，这将继续循环。

所以让我感到困惑的是线路测试next == "taunt bear" and bear_moved。如果我的输入是taunt bear，它应该是"taunt bear" == "taunt bear"，bear_moved哪个是True and True？这意味着循环将继续而不是取消它。

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2 回答 2

0

while True:将无限期地继续（除非您输入break- 通常break在 Python 等语言中是糟糕的设计））。

你可能想做：

while something == True: #Or - as has been pointed out, `while something` - which is equivalent and more Pythonic
    ...
    some code which eventually sets something to False
    ...
于 2013-09-05T20:23:51.460 回答
0

elif在 python 中相当于else if. 如果其中一个elif块执行，其他块都不能，并且会跳到if.

Afternext == "taunt bear" and not bear_moved被执行并评估为真，并且块执行，程序的控制继续回到循环的前面，并将再次要求输入。

于 2013-09-05T20:28:37.620 回答